gengliangwang opened a new pull request #24776: [SPARK-27926][SQL] Allow altering table add columns with CSVFileFormat/JsonFileFormat provider URL: https://github.com/apache/spark/pull/24776 ## What changes were proposed in this pull request? In the previous work of csv/json migration, CSVFileFormat/JsonFileFormat is removed in the table provider whitelist of `AlterTableAddColumnsCommand.verifyAlterTableAddColumn`: https://github.com/apache/spark/pull/24005 https://github.com/apache/spark/pull/24058 This is regression. If a table is created with Provider `org.apache.spark.sql.execution.datasources.csv.CSVFileFormat` or `org.apache.spark.sql.execution.datasources.json.JsonFileFormat`, Spark should allow the "alter table add column" operation. ## How was this patch tested? Unit test
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